Investigating the sorption behavior of selenite on commercial partially oxidized magnetite nanopowder under aerobic conditions: Characterization and mechanisms

Urbánová, Lenka; Bujdoš, Marek; Matulová, Michaela; Miglierini, Marcel B.; Vyhnáleková, Silvia; Orovčík, Ľubomír; Machata, Peter; Mičušík, Matej; Dobročka, Edmund; Kollár, Jozef; Matúš, Peter; Urík, Martin

doi:10.1016/j.seppur.2024.127688

Separation and Purification Technology

2024

DOI: 10.1016/j.seppur.2024.127688

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Investigating the sorption behavior of selenite on commercial partially oxidized magnetite nanopowder under aerobic conditions: Characterization and mechanisms

Lenka Urbánová,

Marek Bujdoš,

Michaela Matulová

et al.

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Cited by 3 publications

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Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods

Vyhnáleková,

Miglierini,

Cesnek

et al. 2024

J Radioanal Nucl Chem

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Structural alterations in non-stoichiometric magnetite induced by microorganisms are studied by nuclear methods. Magnetite samples were exposed to fungal strain known for its immobilization capabilities. Neutron activation analysis identified iron as the dominant element. The presence of maghemite in non-stoichiometric magnetite complicates the determination of iron sites by Mössbauer spectrometry. Mössbauer spectra recorded at 4.2 K display overlapping lines corresponding to tetrahedral and octahedral iron sites. Application of external magnetic field of 6 T improved the spectral resolution and revealed a presence of distinct sextets. Interaction with Aspergillus niger did not notably affect magnetite´s magnetic properties, indicating its stability.

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Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods

Vyhnáleková,

Miglierini,

Cesnek

et al. 2024

J Radioanal Nucl Chem

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Computational Study on the Octahedral Surfaces of Magnetite Nanoparticles and Their Solvent Interaction

Katheras,

Karalis,

Krack

et al. 2024

Environ. Sci. Technol.

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Magnetite nanoparticles (MNPs) play an important role in geological and environmental systems because of their redox reactivity and ability to sequester a wide range of metals and metalloids. X-ray absorption spectroscopy conducted at metal and metalloid edges has suggested that the magnetite {111} faces of octahedrally shaped nanoparticles play a dominant role in the redox and sorption processes of these elements. However, studies directly probing the magnetite surfaces, especially in their fully solvated state, are scarce. Therefore, we investigated the speciation and stability over a wide Eh/pH range of octahedrally shaped MNPs of 2 nm size by means of Kohn−Sham density functional theory with Hubbard correction (DFT+U). By altering the protonation state of the crystals, a redox-sensitive response of the octahedrally coordinated Fe could be achieved. Furthermore, the preferential H distribution could be identified, highlighting the difference between the edges, vertices, and facets of the nanocrystals. Subsequently, the interactions of the MNPs with a solvent of pure water or a 0.5 M NaCl solution were studied by classical molecular dynamics (MD) simulations. Finally, a comparison of the corresponding macroscopic magnetite (111) surface to the investigated MNPs was conducted.

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Attenuation of Aqueous Naphthalene through a Constructed Wetland System Employing Lightweight Expanded Clay Aggregate

Adhikary,

Mondal,

Pal

et al. 2025

J. Hazard. Toxic Radioact. Waste

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Investigating the sorption behavior of selenite on commercial partially oxidized magnetite nanopowder under aerobic conditions: Characterization and mechanisms

Cited by 3 publications

References 88 publications

Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods

Microbial-induced structural changes in non-stoichiometric magnetite via radioanalytical methods

Computational Study on the Octahedral Surfaces of Magnetite Nanoparticles and Their Solvent Interaction

Attenuation of Aqueous Naphthalene through a Constructed Wetland System Employing Lightweight Expanded Clay Aggregate

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